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                Zju2112 Dynamic Rankings                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><p>给定一个含有n个数的序列a[1],a[2],a[3]&hellip;&hellip;a[n]，程序必须回答这样的询问：对于给定的i,j,k，在a[i],a[i+1],a[i+2]&hellip;&hellip;a[j]中第k小的数是多少(1&le;k&le;j-i+1)，并且，你可以改变一些a[i]的值，改变后，程序还能针对改变后的a继续回答上面的问题。你需要编一个这样的程序，从输入文件中读入序列a，然后读入一系列的指令，包括询问指令和修改指令。对于每一个询问指令，你必须输出正确的回答。 第一行有两个正整数n(1&le;n&le;10000)，m(1&le;m&le;10000)。分别表示序列的长度和指令的个数。第二行有n个数，表示a[1],a[2]&hellip;&hellip;a[n]，这些数都小于10^9。接下来的m行描述每条指令，每行的格式是下面两种格式中的一种。 Q i j k 或者 C i t Q i j k （i,j,k是数字，1&le;i&le;j&le;n, 1&le;k&le;j-i+1）表示询问指令，询问a[i]，a[i+1]&hellip;&hellip;a[j]中第k小的数。C i t (1&le;i&le;n，0&le;t&le;10^9)表示把a[i]改变成为t。</p></p><hr/><h3>输入格式</h3><p><p>对于每一次询问，你都需要输出他的答案，每一个输出占单独的一行。</p></p><hr/><h3>输出格式</h3><p></p><hr/><h3>样例输入</h3><pre>5 3
3 2 1 4 7
Q 1 4 3
C 2 6
Q 2 5 3
</pre><hr/><h3>样例输出</h3><pre>3
6
</pre><hr/><h3>提示</h3><p><p>20%的数据中，m,n&le;100; 40%的数据中，m,n&le;1000; 100%的数据中，m,n&le;10000。</p></p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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